Hot crude gravity drainage (HCGD) for heavy and extra-heavy enhanced oil recovery (EOR)

An industrial process comprising:

• mixing heavy or extra heavy crude with a solvent to lower an original viscosity of the crude to ease a flow of the crude to a crude tank;
• once the crude tank reaches a volume threshold, using a crude injection pump to start to circulate the crude through a heater;
• using a downhole separator to separate crude oil and gas coming from production sand at a suction of a progressive cavity pump (PCP), wherein the crude is sent to a surface by the PCP pump, and the separated gas goes to the surface through a casing;
• separating the liquid contained in the gas from the gas in a gas separator;
• returning the separated liquid to the crude tank;
• using the heater to increase a temperature of the crude to an injection temperature;
• after the crude passes through the heater, mixing a part of the crude with cold crude to be injected into an oil well to heat up the cold crude to a crude tank desired temperature;
• after the heater, using a hot crude recirculation line to send part of the crude into the crude tank to complete heating of the incoming crude to the tank desired temperature;
• and
• simultaneous with the use of the hot crude recirculation line to send the part of the crude into the crude tank, injecting the hot crude at a required temperature into the production sand through an injection line that runs from an oil wellhead to a location determined by geological information of oil sands surrounding an oil well horizontal liner, wherein the hot crude goes directly into the producing sand.